Spinach & Mushroom Crustless Quiche (Frittata)

Spinach & Mushroom Crustless Quiche is a rich yet vegetable-forward dish made with tender mushrooms, wilted spinach, aromatic onion and garlic, fluffy eggs, cream, fresh herbs, and plenty of melted mozzarella. Without a pastry crust, the filling becomes the true focus: soft vegetables suspended in a creamy, cheesy egg custard with a beautifully golden top.

The mushrooms bring earthy, savory depth while spinach adds freshness and a mild vegetal flavor. Parsley, chives, and dill keep the quiche aromatic and prevent the eggs and cheese from feeling overly heavy. Mozzarella melts throughout the custard, giving each slice a soft, stretchy, creamy texture.

One of the biggest advantages of a crustless quiche is its simplicity. There is no dough to roll, chill, or blind-bake, and the dish can move easily from breakfast to brunch, lunch, or a light dinner. Served warm or at room temperature, it is equally suited to a relaxed family meal or a brunch table.

Why People Will Love Spinach & Mushroom Crustless Quiche (Frittata) Recipe

It has all the creamy richness of quiche without requiring pastry.

Mushrooms provide deep, savory umami flavor.

Fresh spinach adds color and balances the richness of the cheese.

Mozzarella melts beautifully throughout the egg filling.

Heavy cream creates a soft, luxurious custard.

Onion develops gentle sweetness as it cooks.

Garlic adds an aromatic savory backbone.

Parsley brings freshness to the finished quiche.

Chives contribute a delicate onion flavor.

Dill adds a subtle herbal brightness that works especially well with eggs.

It is naturally lower in carbohydrates than a traditional pastry-based quiche.

There is no crust to become soggy.

The recipe is easy to assemble.

It can be prepared ahead for breakfast or brunch.

It works well both warm and at room temperature.

It is substantial enough for a meatless meal.

The vegetables and cheese can easily be customized.

It reheats well for quick breakfasts or lunches.

It pairs beautifully with fresh salad, roasted potatoes, or crusty bread.

Key Ingredients

Mushrooms:
Mushrooms are responsible for much of the savory character of this quiche. When properly sautéed, they lose excess water and develop a concentrated, almost meaty flavor.

Fresh Baby Spinach:
Spinach wilts quickly and distributes easily throughout the egg custard. Its mild flavor complements mushrooms without competing with the herbs or cheese.

Eggs:
Eggs provide the structure that holds all of the vegetables and cheese together. Six eggs give the quiche enough body while still allowing it to remain tender.

Heavy Cream:
Cream enriches the eggs and creates a softer, silkier texture than eggs alone. It also helps balance the earthy mushrooms and greens.

Mozzarella Cheese:
Mozzarella contributes mild dairy richness and excellent melting qualities. Because its flavor is gentle, the mushrooms, garlic, and herbs remain noticeable.

Onion and Garlic:
These aromatics build the savory foundation. Cooking them before adding the egg mixture removes their raw sharpness and develops sweetness.

Parsley, Chives, and Dill:
Using several herbs provides more complexity than relying on a single seasoning. Parsley is fresh, chives are mildly onion-like, and dill adds a distinctive aromatic note.

Expert Tips

Slice the mushrooms evenly so they cook at approximately the same rate.

Use a wide skillet so the mushrooms can sauté rather than steam.

Let mushrooms release their moisture and continue cooking until much of that liquid evaporates.

Avoid overcrowding the skillet if possible.

Add garlic toward the end of sautéing so it does not burn.

Add spinach only after the mushrooms and onion are nearly finished.

Cook the spinach just until wilted.

If the cooked spinach releases a lot of water, gently squeeze or drain off the excess.

Allow the vegetable mixture to cool slightly before combining it with the eggs.

Bring eggs closer to room temperature for a more evenly blended custard.

Whisk the eggs thoroughly before adding cream and cheese.

Reserve some mozzarella for the top rather than putting all of it inside.

Grease the baking dish thoroughly because there is no crust protecting the edges.

Spread the vegetables evenly before pouring over the custard.

Avoid overbaking; the center should be set but still tender.

Let the quiche rest before slicing so the custard can stabilize.

Spinach & Mushroom Crustless Quiche

Ingredients:

300g/10.6oz sliced mushrooms

200g/7oz fresh baby spinach

1 small onion, diced

2 cloves garlic, crushed

6 beaten eggs (room temperature)

1/2 cup double cream/heavy cream

2 cups shredded mozzarella plus extra for topping

1 tbsp chopped fresh parsley

1 tbsp chopped fresh chives (or 1 tsp dried)

1 tbsp chopped fresh dill (or 1/4 tsp dried)

Salt & pepper to taste

Instructions:

Preheat the Oven: Set your oven to 180°C (350°F).

Cook the Vegetables: In a skillet, heat a bit of olive oil. Sauté the diced onion, sliced mushrooms, and crushed garlic until softened. Add the baby spinach and cook until just wilted. Remove from heat and set aside.

Prepare the Egg Mixture: In a mixing bowl, whisk together the beaten eggs, double cream, shredded mozzarella, fresh or dried herbs, and season with salt and pepper.

Grease the Dish: Lightly butter a 28cm (11-inch) quiche dish and spread the sautéed vegetables evenly in the dish.

Combine Ingredients: Pour the egg mixture over the vegetables, using a fork to gently mix them so that the eggs and cheese are evenly distributed.

Add More Cheese: Sprinkle a little extra shredded mozzarella on top.

Bake: Place in the oven and bake for about 45 minutes, or until the top is golden.

Serve: Enjoy the quiche on its own, with fries, a fresh salad, or wrapped in rolls or wraps.

Enjoy your delicious Spinach & Mushroom Crustless Quiche!

Important Notes When Making Spinach & Mushroom Crustless Quiche (Frittata)

Mushrooms and spinach both contain a significant amount of water.

Removing excess vegetable moisture is the most important step for preventing a watery quiche.

Do not add raw mushrooms directly to the egg mixture.

Spinach should be wilted and any obvious excess liquid removed.

Fresh mozzarella is considerably wetter than low-moisture shredded mozzarella; low-moisture

mozzarella is generally easier for this recipe.

If using fresh mozzarella, drain it very thoroughly.

Pre-shredded mozzarella works, although freshly shredded cheese generally melts more smoothly.

Heavy cream makes the quiche rich; half-and-half can be substituted for a slightly lighter version.

Dried herbs are more concentrated than fresh herbs, so use the smaller quantities indicated.

Salt carefully because mozzarella already contains sodium.

A 28 cm / 11-inch dish creates a relatively broad quiche, so cooking time can vary with dish depth.

The center may still move very slightly when the quiche is properly baked.

It continues setting for several minutes after leaving the oven.

Excessive baking can make the eggs rubbery and cause moisture to separate.

Let the quiche rest for at least 10–15 minutes before slicing.

Refrigerate leftovers promptly after cooling.

How to Enjoy Spinach & Mushroom Crustless Quiche (Frittata) After Cooking

Remove the quiche from the oven when the top is golden and the center is just set. Let it rest for approximately 10–15 minutes before cutting. This makes the texture firmer while keeping the inside soft and creamy.

Slice it into wedges with a sharp knife and serve warm.

For breakfast or brunch, pair it with fresh fruit, sliced avocado, roasted breakfast potatoes, or toasted sourdough.

For lunch, serve a slice alongside a crisp green salad dressed with lemon vinaigrette. The acidity is particularly good at balancing the mozzarella and cream.

For dinner, pair the quiche with roasted vegetables, sautéed asparagus, tomato salad, or garlic bread.

A spoonful of pesto or a little tomato relish can add extra brightness without overpowering the mushrooms.

If you want a fresh finishing element, scatter additional chives, parsley, or dill over each slice immediately before serving.

The quiche is also delicious at room temperature, making it useful for buffets, picnics, and brunch gatherings.

For leftovers, reheat slices gently in a moderate oven or microwave only until warm. Excessive reheating can toughen the egg custard.

Nutrition Information

Approximate nutrition per 1 slice, based on 8 servings, assuming about 1 tablespoon olive oil for sautéing and a small additional amount of mozzarella on top:

Calories: 245 kcal | Total Fat: 18 g | Saturated Fat: 9 g | Monounsaturated Fat: 5.2 g | Polyunsaturated Fat: 1.6 g | Cholesterol: 155 mg | Sodium: 390–520 mg depending on the mozzarella and added salt | Total Carbohydrates: 6 g | Dietary Fiber: 1.3 g | Sugars: 2.5 g | Protein: 15 g

Additional estimate:

Potassium: 430–550 mg | Calcium: 280–350 mg | Iron: 2–2.8 mg | Magnesium: 45–60 mg | Vitamin A: 3,500–4,800 IU | Vitamin C: 10–16 mg | Folate: 90–130 mcg | Vitamin B12: 0.9–1.3 mcg

Frequently Asked Questions:

Can I make this quiche ahead of time?

Yes, you can prepare it a day in advance and store it in the refrigerator.

Just reheat gently in the oven or microwave before serving.

Is it possible to use frozen spinach instead of fresh?

Absolutely! You can use frozen spinach; just make sure to thaw and drain it well to remove excess moisture before adding it to the quiche.

Can I add meat to this recipe?

Yes! Cooked bacon, sausage, or ham can be added for extra flavor.

Just mix it in with the vegetables before pouring the egg mixture over.

How do I know when the quiche is done baking?

The quiche is done when the top is golden brown and a knife inserted in the center comes out clean.

It should also be slightly puffed up.

What can I serve with this quiche?

This quiche pairs well with a fresh salad, roasted vegetables, or even a side of fruit.

It’s also delicious on its own!

Can I substitute the heavy cream?

Yes, you can use milk or a dairy-free alternative like almond or coconut milk.

Just keep in mind that using milk may result in a slightly less creamy texture.

What if I don’t have fresh herbs?

If you don’t have fresh herbs, you can use dried herbs instead.

Use about one-third of the amount since dried herbs are more concentrated in flavor.

How can I make this quiche lighter?

To lighten the quiche, you can reduce the amount of cheese and use half-and-half instead of heavy cream.

You can also add more vegetables for added volume without extra calories.

Is it necessary to sauté the vegetables first?

While it’s recommended to sauté the vegetables for better flavor and texture, you can skip this step if you’re short on time.

Just be aware that the texture may be a bit different.

Can I use a different type of pan?

Yes, you can use a different type of baking dish, such as a round or square cake pan.

Just adjust the baking time as needed, since the depth of the dish can affect how quickly it cooks.